diff --git a/.gitignore b/.gitignore
index cc13a796..7cb533c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,3 +41,6 @@ pnpm-debug.log*
 # Vendored agent skills installed via `npx … skills install` (e.g. impeccable).
 # Owned upstream, re-installable on demand — not vendored into the repo.
 .github/skills/
+
+# Temporary credentials generated by google-github-actions/auth.
+gha-creds-*.json
diff --git a/.prettierignore b/.prettierignore
index aab52009..476be9fc 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -36,3 +36,6 @@ src/layouts/BaseLayout.astro
 
 # Lockfile
 package-lock.json
+
+# Temporary credentials generated by google-github-actions/auth.
+gha-creds-*.json